Serrated knife



FIG. 1 shows a perspective view of a serrated knife showing my new design;

FIG. 2 shows a left side view thereof;

FIG. 3 shows a right side view thereof;

FIG. 4 shows an end view thereof;

FIG. 5 shows an opposing end view thereof;

FIG. 6 shows a top plan view thereof; and,

FIG. 7 shows a bottom plan view thereof.

The shade lines in the Figures show contour and not surface ornamentation.

The broken lines shown in the Figures show portions of the serrated knife which form no part of the claimed design. 

CLAIM The ornamental design for a serrated knife, as shown and described. 